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Diversity of escolitids in plantations of tectona grandis l.f. in the province of Esmeraldas, Ecuador

Abstract:

The present study aimed to identify and determine the diversity of scolithids, their abundance and diversity index associated with plantations of Tectona grandis L. f. (teak). This study was carried out at the Zambrano, La Mala and Tepeyac sites, located in the Esmeraldas canton, Esmeraldas province. To determine diversity, 36 flight intersection traps were placed at a height of 1.30 m, at ground level, the traps were baited with 175 ml of 96 ° alcohol and 75 ml of distilled water. The insects were collected every eight days, for two months, from the end of July to mid-September 2018. The identification was carried out in the UTEQ microbiology laboratory with the help of a stereomicroscope and keys dichotomous. To determine the abundance and diversity index of scolithids, we proceeded to identify trees that presented symptoms of regressive death and vascular wilting, then nine diseased trees were felled per site and sectioned every four meters, later the wood was opened for the collection of insects, which were deposited in bottles with 70 ° alcohol, for the respective identification. The scolithids that were collected through the traps had a total of 3747 insects, the most abundant genus being Hypothenemus sp. and the species Xyleborus affinis and Premnobius cavipennis. While the most abundant scolithids found within the wood were: Xyleborus ferrugineus, Coptoborus sp. and Premnobius cavipennis.